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A crowd is a large number of people who gather together with a common short-term or long-term purpose.
A conventional crowd is a collection of people who gather for a specific purpose.
An expressive crowd is a collection of people who gather primarily to be excited and to express one or more emotions.
As its name implies, an acting crowd goes one important step beyond an expressive crowd by behaving in violent or other destructive behavior such as looting.
a fifth type of crowd is the protest crowd. A protest crowd is a collection of people who gather to protest a political, social, cultural, or economic issue.
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